<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<script type="text/javascript">
			function fn1(a, b) {
				console.log(a);
				console.log(b);
			}

			// fn1(1, 2);

			function fn2(a, b) {
				console.log("fn2..." + a + "," + b);
			}

			function fn3(fn) { //高阶函数
				fn(666, 999);
			}

			fn3(fn2);
		</script>
	</head>
	<body>
	</body>
</html>
